Capacity: how to populate from jira

I would like to know how the Original Estimate and Work Done fields are configured in Aha!. I have mapped (Jira)Total Story Points to (Aha!) Original Estimate and (Jira) Completed Story Points to (Aha!) Work Done. I'd like to know how to these populate in Aha! to get Work remaining to be the difference between Original Estimate and Completed Story points